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Editorial Staff Asian Journal Scieence and Engineering Jl. Soekarno Hatta No.9, Jatimulyo, Kec. Lowokwaru, Kota Malang, Jawa Timur 65141
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Asian Journal Science and Engineering
Published by CV. Creative Tugu Pena
ISSN : 29636752     EISSN : 29636752     DOI : http://dx.doi.org/10.51278/ajse.v1i2.545
Core Subject : Science, Engineering,
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering
Asian Journal Science and Engineering publishes all those best ideas from the science, which can be introduced in the engineering. Since, obtaining the high-quality, competitive products is based on introducing high technologies from various independent spheres of scientific researches, but united by a common end result - a finished high-technology product. The purpose of this journal is to publish quality articles dedicated to the scientific research development that focuses Mechanical Engineering, Civil Engineering, Chemical Cngineering, Electrical Engineering, Engineering Physics
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 8 Documents
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Search results for , issue "Vol. 4 No. 1 (2025): Asian Journal Science and Engineering" : 8 Documents clear
Occupational Safety, Health, and Awareness as Determinants of Productivity: A PLS-SEM Study of Construction Workers in Malang Fifi Damayanti; Suhudi; Sigit Febrianto, Redi
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1855

Abstract

This study investigates the influence of Occupational Safety and Health (OSH) practices—comprising Occupational Safety, Occupational Health, and OSH Awareness—on worker productivity within construction projects in Malang, Indonesia. Using a quantitative approach with survey data from 63 construction workers and analyzed through Partial Least Squares Structural Equation Modeling (PLS-SEM), the findings reveal that all three OSH components have a significant and positive impact on productivity. Occupational Health emerged as the strongest predictor (β = 0.377), followed by Occupational Safety (β = 0.350) and OSH Awareness (β = 0.312). Collectively, these variables explain 81% of the variance in worker productivity (R² = 0.810), underscoring the central role of OSH implementation in project performance. The study highlights that tangible investments in worker health and safety are not only ethical imperatives but also strategic drivers of efficiency. It concludes by recommending that construction managers treat OSH not as a regulatory formality, but as a critical asset for enhancing workforce output.
Optimizing Flexibility in SUP9 Leaf Springs: The Synergistic Effect of Tempering Temperature and Holding Time Kris Witono; Agustriyana, Lisa; Hadi Susilo, Sugeng
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1886

Abstract

This study investigates the influence of tempering temperature and holding time on the flexibility of SUP9 steel leaf springs, addressing a practical need for enhanced vibration absorption in heavy-duty vehicles operating on irregular terrain. An experimental study was conducted using a full factorial design with three temperature levels (450°C, 550°C, 650°C) and three holding times (15, 20, 25 minutes). Flexibility was quantified by measuring the maximum deflection in a three-point bending test. The results demonstrate a strong, positive correlation between the tempering parameters and flexibility. The optimal flexibility (47.76 mm deflection) was achieved at the highest treatment condition of 650°C with a 25-minute holding time, representing an 83% improvement over the least effective treatment. ANOVA results confirmed that temperature, holding time, and their interaction are all statistically significant factors (p < 0.05). These findings provide a practical, data-driven guideline for manufacturing more resilient and comfortable leaf springs by optimizing heat treatment protocols.
Analysis of Overheating On Auxiliary Engine Cat 18 On Ahts Ship Logindo Stamina Marshelino Chandra Suhartono; Aziz Nugroho; Trisnowati Rahayu; Antonius Edy Kristiyono; Shofa Dai Robbi; Imam Sutrisno
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1891

Abstract

This research aims to identify and analyze the primary causes of overheating in the CAT 18 Auxiliary Engine aboard the AHTS Logindo Stamina vessel and to evaluate its impact on the vessel’s operational performance. Overheating has been found to significantly reduce Engine efficiency, increase fuel consumption, and potentially cause blackouts that endanger navigational safety. The investigation identified three main causes: cracking of the seawater pump cover, failure of the thermostat due to prolonged use, and clogging of the sea chest strainer by marine debris. A qualitative descriptive method was applied, involving direct observation and interviews with the ship’s Engine crew. The mitigation efforts included repairing the seawater pump cover using high-temperature-resistant Devcon adhesive, replacing the damaged thermostat, and implementing a regular Plan Maintenance System (PMS). The findings underscore the critical importance of proper cooling system management and routine maintenance discipline in preventing overheating and maintaining the reliable operation of auxiliary Engines aboard ships.
Review of Mechanical Characteristics and Flexural Strength of Concrete Beam Material Original Bundubela, East Sumba Ningrum, Diana; Rasidi, Nawir; Frank Rijkaard Mouwlaka, Enroe
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1892

Abstract

The utilization of local aggregates is pivotal for promoting sustainable and cost-effective construction, yet their mechanical viability requires rigorous assessment. This study aims to evaluate the mechanical characteristics and flexural strength of concrete beams formulated with aggregates from Bundubela, East Sumba, to determine their suitability under Indonesian National Standards (SNI). The research employed a laboratory-based experimental method following SNI procedures. Two concrete mixtures were tested: a standard mix designed for a compressive strength (fc') of 21.7 MPa and a second mix enhanced with additives, targeting an fc' of 45 MPa. Results indicated that both mixtures failed to achieve their designed strengths. The standard mix only reached an average compressive strength of 18.15 MPa, while the additive-enhanced mix achieved 28.79 MPa. Furthermore, in flexural strength tests on concrete beams, both configurations exhibited excessive deflection, surpassing the maximum limits allowed by SNI. The beam without additives deflected 4.635 mm under a 1500 Kg maximum load, and the additive-enhanced beam deflected 6.145 mm under a 2100 Kg maximum load. These findings conclude that despite enhancement with additives, the Bundubela aggregate is unsuitable for structural concrete applications that must comply with current SNI requirements. This highlights a critical challenge in reconciling the use of local materials with stringent national construction codes, pointing to the need for material modification or specific-standard development
Beyond Compliance: Quantifying the Impact of Occupational Safety and Health on Worker Performance in High-Rise Construction Ria Riskiyah, Indah; Utoyo, Suselo; Sumardi, Sumardi; Jatu Noviarsita, Radhia; Cahyani, Eri
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1898

Abstract

The construction industry is globally recognized for its high occupational risks, making the implementation of robust Occupational Safety and Health (OSH) programs a critical concern. While the importance of OSH is undisputed, its direct, quantifiable impact on worker performance requires continuous empirical validation. This study aims to analyze the influence of occupational safety and occupational health practices on the performance of workers in a high-rise building project in Surabaya, Indonesia. Utilizing a quantitative approach, data were collected from 63 project personnel via a structured questionnaire. The data were analyzed using multiple linear regression. The results confirm a significant and positive relationship, with OSH practices collectively explaining 44.2% of the variance in worker performance (Adjusted R² = 0.442). A partial analysis of the regression coefficients revealed that occupational safety (β = 0.453) exerts a more dominant influence on performance than occupational health (β = 0.341). This study provides quantitative evidence that OSH programs are not merely a compliance requirement but a direct investment in operational productivity, with tangible safety measures being the primary driver of enhanced worker performance.
The Mediating Role of Trust in The Relationship Between Online Advertising and Purchase Decision in E-Commerce: A Study on Seblak Chips Products in Shopee Santoso, Fuji; Sudarmiatin, Sudarmiatin
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1912

Abstract

The growth of e-commerce has transformed consumer shopping behavior, making online advertising a vital marketing tool. However, trust remains a critical factor in influencing consumer decisions in the digital marketplace. This study aims to examine the effect of online advertising on purchase decisions, with trust as a mediating variable. The research employed a quantitative method using a survey of 120 Shopee users who had purchased Seblak chips in the past three months. Data were analyzed using Structural Equation Modeling (SEM) with SmartPLS 4.0. The findings show that online advertising has a significant positive effect on trust, and trust significantly influences purchase decisions. Furthermore, trust mediates the relationship between online advertising and purchase decisions. These results imply that trust plays a pivotal role in enhancing the effectiveness of online advertising in e-commerce. Business owners should not only focus on creating attractive advertisements but also prioritize building consumer trust through transparent and consistent communication.
Representation of The RAON Management Crewing System in the Management of Seafarers’ Documents at PT Inkor Dunia Samudra Fasya Aulia Sabrina; Agus Leonard Togatorop; Fitri Zuhriyah; Edy Kurniawan
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.1689

Abstract

This research is motivated by issues in the management of seafarers’ documents at PT Inkor Dunia Samudra, which continues to face challenges such as the lack of a centralized archiving system, the high complexity of documents requiring regular validation, and limited staff capacity to monitor document completeness. The purpose of this study is to determine the extent of the influence of the Management Crewing System (RAON System) on the management of seafarers’ documents and how the system serves as a solution to administrative challenges within the company. This research employs a quantitative approach using simple linear regression analysis. Data were collected through a likert-scale-based questionnaire distributed to 48 respondents, consisting of internal staff from PT Inkor Dunia Samudra and representatives of the ship owner. Data analysis was conducted using SPSS 30, with the application of simple regression analysis and t-test. The results show that the Management Crewing System (RAON System) has a significant influence on the management of seafarers’ documents, as evidenced by the t-test result where t-value > t-table (5.981 > 1.679). This is further supported by the coefficient of determination (R Square) from the regression equation Y = 8.444 + 0.417X, which yields a value of 0.438 or 43.8%. The system has proven effective in increasing efficiency, reducing administrative errors, and accelerating document validation processes. Therefore, it is recommended that the company continue to improve the RAON System by expanding its features and providing regular training to ensure optimal use by all staff.
Thermal Analysis and Battery Life of Lithium-Ion 60 Volt / 23 Ah with Variation of Engine Rate on 3000 W Electric Motorcycle Prototype Arif Devi Dwipayana; Ainul Ghurri; Suprapta Winaya
Asian Journal Science and Engineering Vol. 4 No. 1 (2025): Asian Journal Science and Engineering
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/ajse.v4i1.2043

Abstract

Lithium-ion batteries in electric vehicles face challenges in terms of energy conversion efficiency and thermal resistance. One of the main factors affecting battery performance is the variation in engine speed, which has an impact on current consumption, voltage changes, and an increase in battery temperature. This study aims to comprehensively analyze the effect of engine speed variation on the electric current consumption, battery life, and thermal characteristics of a 60V/23Ah lithium-ion battery in a 3000W electric motorcycle prototype. In addition, this research also evaluates the durability of the battery under varying operational conditions to identify potential optimizations of the battery management system. The methods used in this research involved MATLAB-based experiments and simulations. Tests were conducted by measuring battery current, voltage, and temperature at six different engine speed levels, and then compared with simulation results developed using a mathematical model based on motor efficiency and battery internal resistance. The results show that an increase in engine speed is directly proportional to the current consumption and a decrease in battery voltage. In addition, the battery temperature increases steadily, with relatively small differences between experimental and simulation results. This research contributes to a better understanding of the energy dynamics of electric vehicle battery systems and offers a simulation model approach to optimizing the design of battery management systems. The results of this study can be used to improve energy conversion efficiency and extend battery life in electric vehicles. Further research can be conducted by considering more complex environmental parameters, such as cooling effects and vehicle dynamic load variations.

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